Integrated Intelligent Energy

Reflection on scientific and technological innovation in China Huadian Corporation

ZHANG Dongxiao

2009, 31(2): 1-3.

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The lifetime diagnosis of superheater based on oxide skin measurement

LIU Hongguo

2009, 31(2): 4-6.

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The superheater pipes of a certain power plant were detected by using the fast, non-destructive testing of inside oxide skin of boiler pipes and metallographic examination, and their lifetimes were diagnosed. The result shows that the thickness of inside oxide skin of superheater pipes is less than 0.15mm, the thickness of metal layer is no found to reduce obviously, its hardness is normal, the aging level of 12Cr1MoV is 3 which is moderate aging, TP347shows aging trend, the residual lifetimes of each pipe are longer than 60000h.

Test and analysis of welding residual stress of interflow type hydraulic turbine runner

LEI Qinghua

2009, 31(2): 7-10.

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Based on the residual stress tests of interflow type hydraulic turbine runner of some hydroelectric power stations in southwest China, this article introduced the indentation strain gage method and its characteristics of the newest application in hydraulic turbine runner residual stress tests, and according to the test data, the runner residual stress distributed condition was analyzed. Combine with the information of other hydroelectric power stations, the reasons of crack appeared have been discussed in the runner production process and operation, the relation between crack and welding residual stress has obtained. The way to solve the question has been put forward finally.

Application of synchronized online chemical cleaning technology in power plant

KONG Qingfu;MIN Zhihui

2009, 31(2): 12-15.

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The synchronized online chamecial cleaning of 3×390MW units circulating water system was implemented by using the chamecal online cleaning technology, in which the Y-CH107 cleaning agent was used, the integrated biofouling removal, cleaning and passivation processes were adopted. The cleaning process did not influence units generation, the pH value was controled in range 4 to 5. Then the corrosion rates of materials in the system were controled effectively. Taking the 3×390MW combined gas and steam turbine units of Hangzhou Huadian Banshan Generation Corporation Limited as examples, the application, implement process and effect of circulating water system chamecal online cleaning technology were described briefly, and its economic benefit was analyzed.

Analysis of reformation of electrical equipment in Xiaoshunjiang Pump Station

WU Chungang;SHI Liandong

2009, 31(2): 16-18.

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The necessity of electrical equipment reformation in Xiaoshunjiang Water Transfer Pumping Station Project Phase I was analyzed. In order to ensure the water feeding to Shaoxing to be no interrupted and to ensure the construction quality of the project, the safety and fasibility of the reformation scheme were analyzed and compared. After reformation, the pumping station operated favorably, and the fault rate was reduced obviously.

Analysis of a reversed feeding fault from secondary to primary circuit in the substation

SHU Yishi;MA Yong;YU Peijie

2009, 31(2): 19-21.

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A reversed feeding fault from secondary to primary circuit in the medium pressure switch No.2 main transformet of Chapeng Substation at turn on operation was analyzed. The reason of the reversed feeding fault was found, and the dangers of the fault to system were expounded. Aiming at the defect of feeding operation, some improvement measures were proposed for the elated technician referring.

Analysis of ash fouling of air preheater and solving measures

XIAO Xingquan

2009, 31(2): 22-23.

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The serious ash fouling fault was happened in air preheater of boiler No.4 of Xinjiang Huadian Hongyanchi Power Generation Corporation Limited, which influenced on the stability of pulverized coal combustion and the safety of electrostatic precipitator, and the boiler was be compelled to shut down for cleaning the deposited ash manually. The reason of ash fouling in air preheater was analyzed, some detailed preventive measures were put forward, and the problems of ash fouling in air preheater and low temperature corrosion were solved.

Design of water regime autoforecasting system based on GPRS technique

SHAO Jiangli

2009, 31(2): 24-25.

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A water regime autoforecasting system based on the general packet radio service（GPRS） technique was designed for the forecasting system working timely and accurately, the system was composed by telemetry station, GPRS modules and information center, and the modules are includes data acquisition module, information transmission module and memory analyzing module. It has been proved by application that the system was high reliability, wide covering range, convenient stationing, easy expansion, fast networking, low cost of maintenance.

Study on hydraulic plan in plant location selection of nuclear power plant

ZHOU Jinquan

2009, 31(2): 26-31.

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The promulgation of 《Medium and Long Term Nuclear Power Industry Development Plan (2005—2020)》 by China State Council indicated the policy for nuclear power industry would change from "proper development" to "positive development". Except the coastal area, new nuclear power plants will also be constructed in inner land area. The plant location selection of nuclear power plant should be very scientifically, carefully and strictly, beside geology, meteorology, hydrology, hydraulic, nature environment and safety, the problems about adopting natural ventilation, mechanical draft cooling tower for water resource saving, ensuring safe water supplication and satisfying the discharge standard should be considered especially in inner land area.

The research of fusion diagnosis method based on D-S evidence theory for vibration signals of centrifugal pump

FAN Zhihua;HONG Jun

2009, 31(2): 32-35.

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According to the characteristics of fault diagnosis for centrifugal pump, wavelet package decomposition and reconstruction technique is used to extracting frequency band energy feature, a fusion diagnosis method is presented by using fuzzy neural network and D-S evidence theory for centrifugal pump. Firstly, according to the method of wavelet package, vibration signals of displacement and acceleration of centrifugal pump were disposed and transformed into feature vector value; then, two subFNN structures were established, and their training samples were obtained. After two subFNN were trained successfully, the intermediate diagnosis results were obtained through two subFNN. Finally, the FNN diagnosis results were used as the basic probability distribution value to each fault mode, and the D-S evidence theory was applied, and the final fusion diagnosis results were obtained. The experimental result was to verify the method presented in this paper.

Generator hydrogen data management system Based on VB

CAO Deping

2009, 31(2): 36-39.

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Based on Visual Basic 6.0, according to the related regulations and calculation methods of DL/T 651—1998《Requirements for Hydrogen Humidity of Generators Using Hydrogen as a Coolant》，quoting some application software such as Microsoft Office Access, Microsoft Excel，the generator hydrogen data management system was developed. The problem of converting the hydrogen humidity of generator by Lookup table only is resolved, and standardization and routinization of hydrogen data storage was realized. This system was applied in Hunan Huadian Changsha Power Generation Corporation Limited successfully, the calculation and management of hydrogen data was rapider, more convenient and more normative due to application of this system.

Reason analysis of common faults of frequency converter and handling

ZHANG Hao;HAO Peijun;CHANG Shujiang

2009, 31(2): 40-44.

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The faults of frequency converters inslalled in subsidiary system of Shanxi Guohua Jinjie Energy Source Corporation Limited in 2007 were analyzed. The common faults of frequency converters and relevant handling measures were summarized and provided to relevant technican for reference.

Improvement of measurement and adjustment of labyrinth clearance in turbine set

WEI Tiechen

2009, 31(2): 45-47.

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The function of steam sealing is to reduce the steam leakage loss of turbine. The qualified labyrinth clearance can ensure the relative inner efficiency of turbine, smaller labyrinth clearance will influence on turbine safety operation, and bigger labyrinth clearance will reduce inner efficiency of turbine. In overhaul, the adjustment quality of labyrinth clearance is very important for turbine safety, economical operation. The traditional labyrinth clearance overhaul process has some defects which cause the qualification rate of labyrinth clearance to be lower. The test and adjustment methods of labyrinth clearance were improved, and which was helpful for unit safety and economical operation.

Analysis of the signal "springstored energy is abnormal" of breaker and handling plan

ZHANG Fuping

2009, 31(2): 48-49.

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The signal "springstored energy is abnormal" was given out frequently by the breaker spring storage operation mechanism in Jinshuitan Hydropower Plant.The three states indicated by the signal "springstored energy is abnormal" were analyzed. The signal processing flow of programable logic controler(PLC) was optimized, and the handling plan for improving the signal "springstored energy is abnormal" was proposed.

Discussion on reform of circulating cooling water system in 125MW unit

HUANG Wei

2009, 31(2): 50-51.

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The existed problems of the low condenser vacuum value and low thermal efficiency of 125MW unit in Pingxiang Power Plant were analyzed. The problems have been solved by reforming the circulating cooling water system, and the favorable results have been reached.

Application of grid islanding and load shedding schedule in INDORAMA Project of Indonesia

MA Hongtao

2009, 31(2): 52-54.

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The characteristic，logical function and application of grid islanding and load shedding schedule were introduced, which was applied in the partial power net composed by the INDORAMA Captive Power Plant, INDORAMA SYNTHETICS TBK and Indonesia National Power Grid (PLN). In the process of formulation and implementation of the technical schedule, not only the demands of electrical system standards of China were considered, but also the experiences of abroad electric system experts were absorbed and syncretized. When the voltage of National Power Grid is failure, the schedule can ensure the Captive Power Plant can operate at islanding mode, and can shed load automatically according to the plant capacity and practical load. The schedule is summary of Capital Power Plant (small power synchronized system) splitting and load sheding design and logical function, and it is expected that the schedule is helpful for the engineers working at power plant construction.

Analysis of the "blower pinch" of the primary air fan in CFB boiler

ZHAO Xiaodong;ZHANG Lequn

2009, 31(2): 55-59.

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The technical reformation of fans by using the frequency converter is gradually becoming the popular way to increase the efficiency of the power plant. However, the problem of "blower pinch" was happened sometimes due to application of the frequency converter, which causes a great threat to the safety operation of the power plant. The "blower pinch" phenomenon occurred in a power plant after the frequency conversion reformation was analyzed, and feasible solving measures were proposed.

Online setting of safety valve in main steam pipe of ultrasupercritical boiler

SHAO Tianyou;MA Chuangang

2009, 31(2): 60-62.

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The first Blevel maintenance of boiler No.2 of 1000MW ultrasupercritical unit in Huaneng Yuhuan Power Plant was accomplished after one year of operation, and online setting process was used in the maintenance for the safety valve of boiler pipe. The principle and the process flow of online setting were introduced emphatically, the result of online setting was analyzed. The problems occurred in setting process and their solution were described, according to these, some rationalization suggestions for subsequent safety valve setting of ultra-supercritical boiler were proposed.

Reason analysis of bush burning loss fault of steamdriven feed pump in 600MW unit and countermeasure

WANG Yong;ZENG Yuehu

2009, 31(2): 63-66.

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The bush burning loss fault of steamdriven feed pump was happened repeatedly in 2×600MW units of Hunan Huadian Changsha Power Generation Corporation Limited, and which caused a grave threat to units safety operation. The parameters before and after bush burning loss were compared, the bush burning loss appearance was analyzed, and some experiments were accomplished. Then the basic reasons of bush burning loss fault were found which is that there were large particulates in oil and the oil temperature was lower at operation. A series of measures were adopted which includes to increase the lubricating oil pressure, to enlarge the oil inlet throttling plate and to control the oil temperature of small turbine strictly and others, so the problem of bush burning loss was resolved effectively.

The prevention measures of steam turbine unloading at startingup process of S109FA unit

CHENG Tu;YU Lifan

2009, 31(2): 67-70.

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The problem of steam turbine unloading of S109FA unit was introduced. The reason of steam turbine unloading, which often occurred at cold start process, was analyzed in detail. The effective method for solving the problem was proposed, which can be used as reference for same unit in other plants also.

Exploiting and application of Clean Development Mechanism

FANG Zheng

2009, 31(2): 71-73.

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The main content of Clean Development Mechanism, the project exploiting procedure and the development of international carbon market were introduced. Based on this, the application of Clean Development Mechanism in domestic, the transaction method and its impetus to the new energy source development were expounded. The development potential of Clean Development Mechanism market was prospected.

Biogas power generation technology and waste heat utilization technology

LIU Xianming;LI Heping;YUN Xiaoyin;ZHANG Yu;QIU Hemei

2009, 31(2): 74-78.

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The development of biogas power generation technology was introduced. Based on the four determinant indexes which inclutes the total solid, the biochemical oxygen demand, the chemical oxygen demand and volatile solid, combining with the principle of practical fermentation process, the biogas productions of diffirent raw materials were obtained. Aimming at the practical situation of biogas power generation project, the fasibilities of several plans for waste heat utilization of biogas power generation were discussed.

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